MAX9700DEUB+

Audio Amplifiers Overview

The MAX9700DEUB+ is a mono Class D audio power amplifier manufactured by Analog Devices Inc./Maxim Integrated. It delivers 1.2W into an 8Ω load with efficiencies exceeding 90%. The device operates on a single supply voltage ranging from 2.5V to 5.5V and features a fully differential input architecture. Key electrical parameters include a quiescent current of 4mA, shutdown current of 0.1μA, THD+N of 0.01%, and PSRR of 72dB at 217Hz. It utilizes a low-EMI spread-spectrum modulation scheme that eliminates the need for output filters. The component is housed in a 10-pin μMAX package and is specified for operation over an extended temperature range of -40°C to +85°C.

Audio Amplifiers Feature Summary

• Filterless design utilizing low-EMI spread-spectrum modulation to pass FCC radiated emissions standards without external LC filters
• Fully differential input architecture providing high noise immunity and compatibility with CODECs without requiring input-coupling capacitors
• Integrated click-and-pop suppression circuitry to eliminate audible transients during startup and shutdown sequences
• Optional external SYNC input allowing frequency synchronization to system clocks or cascading multiple units for stereo master-slave configurations

Audio Amplifiers Applications

• Cellular Phones
• PDAs
• MP3 Players
• Portable Audio Systems

Audio Amplifiers Procurement Notes

Verify the specific suffix DEUB against the manufacturer's official datasheet to confirm the package type (μMAX) and gain setting (20dB). Ensure the ordering code matches the required thermal performance and pinout configuration. Cross-reference the part number with the latest revision history to confirm compliance with current environmental standards and manufacturing updates.

Audio Amplifiers Selection Notes

Select this component when board space conservation is critical due to its filterless topology and compact μMAX packaging. It is suitable for battery-powered applications requiring high efficiency (>90%) and low quiescent current. Consider the internal 20dB gain setting; if different amplification levels are needed, variants with lower gains must be selected. Verify that the speaker load impedance supports the desired output power within the specified distortion limits.

Audio Amplifiers Part Context

The MAX9700 series comprises low-EMI, filterless Class D audio amplifiers designed to replace traditional Class AB amplifiers in portable electronics. The family includes variants with different fixed internal gains (6dB, 12dB, 15.6dB, and 20dB) and available in TDFN, μMAX, and UCSP packages. This specific model belongs to the Maxim Integrated portfolio, now part of Analog Devices, focusing on high-efficiency audio solutions for mobile devices.

Audio Amplifiers Replacement Considerations

Direct substitutes within the same family include MAX9700AEUB+, MAX9700BEUB+, and MAX9700CEUB+. These alternatives share the same μMAX package but differ in internal voltage gain settings (6dB, 12dB, and 15.6dB respectively). Ensure the gain difference aligns with the system's signal chain requirements before substitution.

Audio Amplifiers FAQ

How does the MAX9700 achieve filterless operation?

It uses a proprietary modulation scheme that spreads the switching energy over a wide bandwidth, reducing peak spectral components enough to pass FCC emissions standards without an output LC filter.

What is the function of the SYNC pin?

The SYNC pin allows the oscillator frequency to be synchronized to an external clock or another MAX9700 unit, preventing beat frequencies in stereo setups or avoiding sensitive interference bands.

Can the MAX9700 operate with DC-coupled inputs?

Yes, the differential input structure allows for DC coupling, eliminating the need for input-coupling capacitors, provided the input common-mode voltage remains within the specified bias range.